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(No Model.) 8 Sheets-Sheet 1. P. W. POWER. DYNAMO ELECTRIC MACHINE.

No. 596,306. Patented Dec; 28,1897.

ITNESSES: INVENTOR Pomeroy IVPawer.

ATTORN EY 3 Sheets Sheet 2.

(No Model.)

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EMP Wm n PC m E -0 M A N Y D I N V E N T O R Poms/0y, iiTPoa/er.

WITNESSES ATTORNEY m: mums PEYERS co. wowumc" wasummou. u c

3 SheetsSheet 3.

(No Model.)

.P. W. POWER. DYNAMO ELECTRIC MACHINE.

No. 596,306. Patented Dec. 28,1897.

INVENTOR Pamezvy ii Power ATTORNEY THE NORRIS prrzns co. wommmo. WA5H1NGTGN.D.C

UNTTEn STaTEs PATENT CEETCE,

POMEROY VJ. POXVER, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO THE STANLEY ELECTRIC MANUFACTURING COMPANY, OF SAME PLACE.

DYNAMGELEGTMG Macrame,

SPECIFICATION forming part of. Letters Patent No. 596,806, dated December 28, 1897.

Application filed February 12, 1896. Serial No. 578.996. (No model.)

To all whom it may concern: of the shaft C and cutting the armature at Beit known that I, POMEROY W. POWER, a ff and being parallel to the lines of force citizen of the United States, residing at Pittsat the points of division. These parts I) D field, county of Berkshire, and State of Mascarry the stationary armature-coilsEE,which 5 sachusetts, have invented certain new and appearin dottcdlines. Thesecoils areplaccd useful Improvements in Dynamo Electric in the grooves c c in the manner shown, no

Machines, of which the following is a specione coil, however, being in two grooves on fication. opposite sides of the points of division of the My invention relates to dynamo-electric armature. to machines having a stationary armature and The machine shown in the drawings is inarmature-coils. The general arrangement of tended to represent one in which there are in a machine of that class is shown in United the armature two rings G G each having on States Patent to ,Villiam Stanley, J12, and its interior surface a crown or circle of coils John F. Kelly, No. 499,446, dated June 13, similar to those shown in the drawings at E I5 1893. Such machines maybe used as genin Fig. 2. it will, however, be understood erators or motors and, so far as the current that for the purposes of this invention it is used or generated is concerned, may be either immaterial whether one or two crowns be single or double phase, according to the windused, although the different constructions ing and connections, as is well known by will permit somewhat different embodiments 7o 20 those skilled in the art. Armatures in this of the invention.

class of machines may have two crowns or The parts G G of the stationary armature circles of stationary coils supported by lameach consist of semicircular laminated porinated rings or may have a single crown or tions H H within which are the grooves e circle, in which case the corresponding end for the armature-coils. Each of these por- 25 of the inductor has polar projections, while tions H H is supported by an iron framethe other end has a plain cylindrical surface work 1 1 which is made up of several parts with no polar projections, the ring correspondwhich broaden out at points K K, so as to rest ing to that end having its opposing surface securely on the base A. The framework, smooth also. when the machine is in operation, is bolted 30 My invention has for its object to provide a togetl1er,top and bottom, at Z Z and to the base new construction for the rotating inductor in at P. When this divided armature is used in inductor-machines and a means for securely the large-sized machines, it is necessary that and simply fastening the polar projections some special means he provided for separatin place upon the inductor-core in such maing and bringing together the parts of the 35 chines. I attain these objects by mechanarmature. In small sizes this is not necesism shown in the accompanying drawings, in sary, and in such cases the plane of division which is usually horizontal, the upper part being re- Figure 1 is a side elevation. Fig. 2 is an moved or adjusted by the use of a block and end elevation with parts shown in detail. tackle. The special means which I have in- 4o 3 is a detail plan of a wing-table with its imvented for the large-sized machines consist of mediately surrounding parts. Fig. at is an the wing-tables MM attached,preferably reelevation of a detail. Fig. 5 is an elevation movably, to the base A. As shown, they are of a portion of the inductor, showing a poleremovably attached by bolts N N, the outer piece attached; and Fig. 6 is a plan of the ends being supported by smalljaeks O O. At 45 same portion, showing the laminated polethe outer edge of these wing-tables are bearpiece in dotted lines. ings P P for screws RR having the handles In the drawings the base A supports the SS for turning them. The threaded portion standards B B B for the bearings of the shaft of the screws F R engage with threaded 0. Upon this base A there rest two separablocks T,which are fastened to the inner parts I00 50 ble parts D D of the stationary armature, of the frame at 6 t. By this means when the the plane of division passing through the axis bolts Z, Z, and Z are removed either part of the armature can be drawn bodily away from the inductor, as shown in dotted lines in Fig. 2, or pushed toward it, the table and base acting as a way and a resting-place.

The coil for energizing the inductor surrounds it and may be supported in any of the manners well known in the art. If it is normally supported by the armature, it is made so that it can easily go out of or into position when the parts of the armature are separated or brought togetheiyand so that when not supported by the armature it rests upon the inductor or is supported by some temporary external means. A. machine with an armature so constructed is easily inspected, cleaned,an d repaired, and has many advantages in the matter of assembling, both as to its various parts and as to the machine as a whole. \Vhen the machine is provided with the win gtables and operating mechanism, the construction is particularly advantageous in machines of very large size.

Another feature of my improved machine is the manner of fastening the pole-pieces to the periphery of the inductor-core, which is particularly adapted to machines of the class shown herein. The inductor in the machine shown in the drawings consists of a body having a cylindrical surface, on which are two rows of polar projections.

In the drawings, U represents the inductor with the polar projections V V. These are shown on an enlarged scale in Figs. 5 and (3.

'W is the cylindrical periphery of part of the inductor-core. In Fig. 5 the bottom of the figure represents one end, while the top represents the portion facing the other row of polar projections. Just within the row of polar projections is a retaining-ring 1, having extensions 2 conforming somewhat to their faces. On the periphery of theinductor-core at proper intervals just outside this ring are iron dovetails 3 and t, fastened by screws 5 and 6, respectively, forming dovetail spaces between them. The pole-pieces V are made of laminations of iron having dovetail projections corresponding to the spaces between dovetails 3 and 4 and a recess corresponding to the dovetail 3. With this construction the dovetail 3 is first put in position and then the pole-piece slid over it, after which the dovetails at l are secured in place. On the end of the inductor outside the pole-pieces 6 a second ring '7, (shown in dotted lines in Fig. 5,) also having projections 16, corresponding somewhat closely to the polar projections, is secured, the whole making a strong and simple means of connecting the projecting polepieces with their inductor core or cylinder. The inductor-core can with this construction be made massive and not laminated, the only portions of the inductor where lamination is essential being the polar projections.

In some cases I prefer to use the dovetails 3 without the dovetails t 1- to hold to the pro jections, as in that case a greater depth between the polar projections is secured, and in consequence there is less magnetic leakage, and a better curve for the electromotive force is obtained. lVhen the dovetails 4- at are not used, the sides of the polar projections are preferably straight, as shown in dotted lines at 15. The dovetails and spaces may be T- shaped.

In order to utilize advantageously as far as possible the attractive magnetic force in the various parts of the inductor and also to insure less less by leakage, the dovetails 3 and a are so shaped as to form air-gaps in any magnetic circuit passing through them in the general direction of the main magnetic flux. These gaps are formed by the hollows S and 0 and by the space 1.0. It will be seen that all these gaps tend to make the lines of force pass directly from the inductor-corc to the polar projections, which, aside from preventing leakage through the dovetails at- -.t by concentrating the lines of force passing through the inductor-core at the points of contact of the polar projection, increasing the magnetic attraction directly between the core and the projection, which assists to a material degree in holding the projections in position against centrifugal force and the magnetic attraction between the opposing sun faces of the polar projections and the armature.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a dynamo-electric machine having a rotating inductor, laminated polar projections separately fastened to the inductor-core by dovetail fastenings, substantially as described.

2. In a dynamo-electric machine having a rotating inductor, polar projections fastened to the inductor-core by dovetails, the core and the dovetails having air-gaps between them, substantially as described.

In testimony whereof I have hereunto set my hand this 10th day of February, 1896.

POMEROY W. POWER.

lVitnesses:

W. H. LELAND, A. M. CURTIN. 

